Many people during this time, including Washington, felt that slavery was justified because the slaves in America were previously slaves in Africa, and were treated more poorly by their African masters than they were by their American masters. This was of course heavily refuted.
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The Dowding System, Britain's highly successful and complex air defense network, relied heavily on radar. This technique allowed the Royal Air Force (RAF) Fighter Command to respond to oncoming German attacks and make the most use of its limited resources of pilots and aircraft.
